// track what major features we have access to (equiv to browser testing)
	var ie4 = (document.all ? true : false);
	var ns4 = (document.layers ? true : false);
	var w3c = (document.getElementById ? true : false);

	// shortcut function to get object using appropriate browser feature
	function getByID(id)
	{
		if (w3c) { return document.getElementById(id); }
		else if (ie4) { return document.all[id]; }
		else if (ns4) { return document.layers[id]; }
		return null;
	}

	// basic image rollover functions
	function imgOn(id) 
	{ 
       	var objImg = getByID(id);
	    objImg.src = '/Images/'+id+'2.gif';
	}
	
	function imgOff(id) 
	{ 
       	var objImg = getByID(id);
	    objImg.src = '/Images/'+id+'.gif';
	}